note
ikegami
<p>Sometimes programs to use system error codes as exit codes. For example, Perl uses <tt>[doc://$!]</tt> as as the error code when you call <tt>[doc://die]</tt>. A quick and dirty way of finding the meaning of an system error number is to assign it to <tt>[doc://$^E]</tt>.
<c>
$ perl -E'$^E=13; say $^E;'
Permission denied
</c>
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